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Title: CuPt and CuPtRu Nanostructures for Ammonia Oxidation Reaction

Liquid fuels, such as methanol, ethanol, and ammonia, are attractive alternative to hydrogen for fuel cells due to their lower costs for storage and distribution. However, lack of sufficiently active catalysts for their oxidation reactions is a roadblock. Our previous study found that Pt 3Cu nanodendrites yielded higher activity and durability than Pt nanoparticles for methanol oxidation reaction (MOR) in acid. In this study, we synthesized two types of nanostructures of CuPt and CuPtRu catalysts via seed-mediated growth of Pt and Ru on Cu and tested their performance for ammonia oxidation reaction (AOR) in alkaline solution. Unlike for MOR, the nanodendrites do not promote AOR activity - CuPt performs similar to Pt and CuPtRu is less active than Pt. Interestingly, the AOR peak current is increased by 64% on CuPt nanowires and 330% on CuPtRu nanowires as compared to Pt nanoparticles. These results suggest that AOR prefers extended surface on long nanowires, distinctly differing from MOR. This can be contributed to two factors: NH 3 oxidization to N 2 involves dimerization of two N-containing intermediates to form the N-N bond and diffusion batters for adsorbed intermediates are generally lower on terrace than at low-coordination sites. This demonstrated strong effect ofmore » surface morphology will be further studied and utilized in developing advanced AOR nanocatalysts.« less
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [2] ;  [1]
  1. Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Chemistry and Biochemistry
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
BNL-203372-2018-JAAM
Journal ID: ISSN 1938-5862
Grant/Contract Number:
SC0012704; 1703827; AR0000805
Type:
Accepted Manuscript
Journal Name:
ECS Transactions
Additional Journal Information:
Journal Volume: 85; Journal Issue: 12; Journal ID: ISSN 1938-5862
Publisher:
Electrochemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Arkansas, Fayetteville, AR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE
OSTI Identifier:
1430852